Keeper right to return American casual shirt (7)
I believe the answer is:
trustee
'keeper' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?
'right to return american casual shirt' is the wordplay.
'right' becomes 'rt' (abbreviation as in Rt Hon- the Right Honourable).
'to return' is a reversal indicator.
'american' becomes 'US' (United States).
'casual shirt' becomes 'tee' (I've seen this in another clue).
'rt' written backwards gives 'tr'.
'tr'+'us'+'tee'='TRUSTEE'
Can you help me to learn more?
(Other definitions for trustee that I've seen before include "Person administering property for another" , "One with powers of administration over property" , "Member of a fund's governing board" , "Legal guardian" , "Steward" .)